Mooi, FRvan Oirschot, HHeuvelman, Kvan der Heide, HGJGaastra, WWillems, RJL2025-03-142025-03-141998https://rivm.openrepository.com/handle/10029/637605Polymorphism in the Bordetella pertussis virulence factors P.69/pertactin and pertussis toxin in the Netherlands: temporal trends and evidence for vaccine-driven evolution.ArticleInfect Immun 1998; 66:670-52025-03-14